Патент USA US2127614код для вставки
Aug. 23, .1938. ‘ ' - J. w. PARKER GRINDIING WHEEL DRESSING‘UNIT 2,127,614 ' Filed Dec. 5, 1935 INVEN TOR. ATTORNEYS. ‘ 2,127,614 Patented Aug. ' 23, 1938 UNITED STATES - PATENT OFFICE‘. 2,127,614‘ GRINDING WHEEL DRESSING UNIT John W. Parker, Detroit, Mich. Application December 5, v1935, Serial .No. 52,937 5 Claims. (Cl. 125-11) ' porting table 2 by means of bolts ll‘ passing. The invention relates to a grinding wheel dress ‘through a base ?ange l2 of the bed. ~The top of the bed is semi-circular_in form, as shown in supporting bed of a grinding machine. ‘ Figure 1, and is provided at its center with a The general object of the invention is'to provide , vertical bore l3 and a concentric slot Ill. .The 5 5 a dressing unit adapted to dress a grinding wheel underside of the bed i0 is provided with an en to provide a grinding. face of complex contour larged opening l5 coaxial with the bore l3 and with great accuracy. ' the shoulder between the bores I3 and I5 is Another object of the invention is to provide provided with a conical bearing surface IS. A ing unit adapted to_ be mounted upon the Work a/dressing unit having sufficient ?exibility to dress similar but oppositely disposed conical bearing 10 10 the grinding face of a wheel on any desired radius or on straight line at any angle to the wheel axis, or any desired combination of arcs and straight lines. surface I‘! is provided at the upper end of bore l3. Another object of the invention is to provide 15 a dressing unit of the type mentioned having in herent therein means to locate the diamond dressing tool‘ accurately inpany desired plane of reference, in combination with means for estab lishing the path of the tool from such plane of reference in any direction in order to .positively ?x the contour of the wheel face independently of the wheel itself. ' Referring to the drawing in which a preferred form of the invention is shown and wherein like 25 numerals are applied to like parts in the several views, Fig. 1 is a plan view of the dressing unit. Fig. 2 is an elevation, looking from the right of Figure 1. 30 . A vertical trunnion l8 of a turntable I9 is . - Fig. 3 is a vertical section, taken on the line 3-3 of Figure 1. Referring to the drawing, there is shown a portion‘ of a grinding wheel I and a work sup porting table 2 mounted on the bed 3 of the grinding machine for relative movement in lines parallel and perpendicular to a. vertical plane through the wheel axis. The mounting of the grinding wheel and work table on the bed may iournaled within the bore l3 of bed It. The trunnion I8 is provided with a conical bearing 16 surface at its upper end adapted to cooperate with the conical portion ll of the upper end of the bore, and is provided at its lower end with an integral cylindrical extension 20 of reduced‘ diameter. An annular bearing member 2| sur- . rounds the reduced extension 20 andhas a snug ?t therewith, and a pair of lock nuts 22 and 23 are threaded on the end of the extension 20 for the purpose of adjustably ?xing the position of the annular bearing member 2|. Any suitable >means, such as the pin and slot connection 23' ' shown in Figure 3, may be utilized to prevent relative turning movement between the annular bearing~ member 2| and trunnion it! without interfering with relative axial movement of these members. A pressed metal guard 24 surrounds the upper end of trunnion l8 and has a downward ly extending peripheral ?ange overlying a co- ' operating boss or raised portion on the topv of bed In to prevent the entrance of abrasives into 35 the bearing between trunnion l8 and the table. The trunnion mounting just described may be ad justed by nuts 22 and 23 to have a very close fit in the opposed conical portions of bore l3 for be effected in any conventional manner to pro the purpose of accurately ?xing the axis of ro 4o duce the desired relative movement, but, for the tation of the turntable I9. purpose of illustration, the worktable 2 is shown / The turntable I9 is provided with a downward-v mounted on aslide 4 which in turn is mounted - ly extending ?nger 25_ adapted, during pivotal upon ways 5 on the bed 3 of the machine. By movements of the turntable, to e along the operating a suitable control shaft 6, the table outer peripheral arc of the bed In‘; and the outer 45 45 2 may be reciprocated in a plane perpendicular edge of the bed I0 is calibrated, as shown at to the axis of the grinding wheel. Operation of .26 in Figure 2, to indicate the angle at which a control shaft v‘I reciprocates the slide 4 and the ‘ the turntable is positioned with respect to a line table 2 in a plane .parallel to the axis of‘ the perpendicular to the axis of the grinding wheel. grinding wheel. ‘,In addition to the above, the A stud bolt 21‘ is threaded into the underside of 50 50 grinding wheel shaft is adjustable vertically with respect to the d 3 in any conventional manner. not shown, in order to position the axis of the wheel‘ in the same horizontal plane as the work. The dressing unit shown in the drawing com "55 vprises a bed In ?xedly secured to the work-sup-_ the turntable l9, passes through the arcuate slot ‘l4 and is provided with a thumb nut 28 by means of which the turntable may be ?xed in adjusted position.‘ , . > A slide member 29 is mounted upon the turn 55 . 2, 127,6 14 table ‘8 9 and connected for sliding movement with‘ respect thereto by means of the conventional the trunnion 55 between the bed l9 and the dovetail slide arrangement shown at 30 in Figure It will be apparent that if the distance between 2. A feed screw 3| rotatably carried by ‘the turn table is threaded into a block 32 having an in tegral projecting pin 33 journaled in a vertical arm 55. ' i . the face 55 and the axis of trunnion I8 is known, the plane of the diamond point 52 may be ac curately positioned either in the plane of the bore in the slide member 29. The feed screw axis of trunnion it or on either side thereof by 3| is ?xed against axial movement with respect any desired amount merely by the use of gauge to the turntable by collars 35 and 35 positionedv blocks between the face 56 and the point 52, or by 10 on opposite sides of an upstanding ?ange 36 on means of the micrometer adjustment on feed the turntable with the result that'rotation of the screw 3|. Should it be desired to position the dia 10 feed screw effects longitudinal sliding movement mond point at a greater distance to the left of of slide member 29. Collar 35 may be provided ‘the axis of trunnion l8 than the normal plane with a micrometer scale calibrated in terms of of surface 56, it is only necessary to withdraw 15 the distance through which member 29 slides trunnion 55 and insert a thicker washer in place for a given‘v rotation of the feed screw. of washer .51, or the same thing may be accom Slide member 2971s provided with a horizontal bore 3'! extending parallel to and directly above plished by feeding the diamond point into contact the feed screw 3| ‘and intersecting the axis ofv with the surface 56 when a thin washer 5] is used, then by swinging ‘arm 54 out of the way 20 trunnion I8. The ends of bore 3? are‘ provided further movement“ of diamond point 52 can be 20 with oppositely directed conical bearing surfaces, eii’ected for measureddistance by means of the similar to those described with respect to bore micrometer ascale. ‘ | 3 in bed I0; and journaled in bore 37 is a trun In operation, the dressing unit is extremely nion 38 having a conical bearing enlargement 39 flexible and may be operated in any one of a 25 adapted to cooperate with the left hand conical bearing surface in bore 31. An annular bearing large number of different methods depending 25 the nature of the grinding surface desired member 40, having a conical surface adapted to upon and the will of the operator. Ingrinding arcs, cooperate with the other conical bearing surface it is necessary to position the axis of trun in bore 31, is slidably mounted on trunnion 38 nion It! on the?rst center of the are by means of 30 and is held against axial movement by a handle\\ the conventional adjustments provided for the éil which, in turn, is ?xed on trunnion 38 by ‘grinding wheel and work table 2, thereupon 30 means of a nut 42 threaded on the reduced end arm 5| carrying the diamond point 52 may be of trunnion 38. The handle 4| is ?xed against ?xed in position by means of pin 44 and the rotational movement with respect to trunnion diamond point positioned at the desired radius‘ 38 by means of a pin 53 extending through the trunnion‘ and handle members. When handle from the axis of trunnion l8 by means of the 35 reference plane 56, gauge blocks, and the microm lil is in the vertical position shown a pin M hav eter adjustment on feed screw 3|. If the wheel ing a knurled end is adapted to be inserted through aligned. openings in the handle 4| and is to be ground with a convex face it is obvious the body" of slide member 29 to ?x trunnion 38 that the diamond point would have to be posi against rotation. A cap screw 55 having a lock - tioned to the right of ‘axis of trunnion It, as 40 viewed in Fig. 3, by an amount equal to the nut 155 is threaded into the slide member 29 and radius of curvature, while a concave grinding may be utilized to engage and lock the trunnion face may be provided by shifting the diamond member 38 against rotation when’ the openings point to the opposite or left side of the axis of in handle 4| and slide member 29 are not aligned. trunnion I8. Once the proper setting is secured Fixed to the left-hand end of trunnion 38, as the face is dressed by swinging turntable l9 about 45 viewed in Figures 1 and 3, is a split clamping , trunnion I8. member 50 in which is clamped the lower end When it is desired to dress the face on a of an arm 5| carrying a diamond point cutting straight line parallel to the axis of the grinding 50 element 52. A cap screw 53 passes through one wheel, and the width of the face is to be sub of the bifurcated ends of‘the clamping member stantial, this can be accomplished by ?xing arm 50 50 and is threaded to‘the other for tightening 5| in the position shown in the drawing and the member about the lower end of arm 5|. > The ' feeding the work table 2 and the wheel axially parts are so arranged that when the knurled with respect to each other by means of the con pin 44is passed throughv the openings~in the 55 ventional feed screws of the grinding machine. handle 4| and- the slide member 29, the arm not shown. The unit, however, is particularly 55 5| will extend vertically with the diamond point adapted for dressing straight line faces of small in the plane of the axes of trunnion members 1 width since these can be dressed by ?xing the 38 and I8. A raised portion 61 on member 29 >work table 2 and wheel- support and merely 60 is provided with a pointer adapted to cooperate: swinging the arm 5| by means of handle 4| . with a micrometer scale on the lower end of handle M to indicate the extent of movement of the diamond point. ' Anarm 54 having ?xed thereto a horizontally 65 extending trunnion 55 journaled in the bed III on an axis in a plane perpendicular to the axis of the grinding wheel is provided for establishing a reference plane for the diamond point with respect to the axis of trunnion member l8. For 70 this purpose the arm 54 is provided with a refer ence surface 56 which is positioned very accu rately ‘at a known distance from the axis of the trunnion l8. The distance between the plane of surface 56 and the axis of trunnion I8 is ?xed 75 by means of a collar or washer 51 positioned on through the small are necessary to dress a straight parallel face. The face can be dressed 'at any angle by merely rotating the turntable to the desired angle as indicated by pointer 25 on the scale at “the periphery of‘ the bed l0, ?xing it in the adjusted position and then swinging arm 5| by means of handle 4|. I _The device is of particular value where it is desired to dress the face of a grinding wheel into a pro?le composed of the combination of one or more radii and one or more straight lines. 70 For example, when dressing a face, the pro?le of which includes a pair of straight lines intersect ing at an: angle, the axis of trunnion l8 can be ?xed on the point of intersection of the two 75 2,127,614 - straight lines on the grinding face. ‘From that position, after one of the surfaces'is dressed by swinging arm 5| back and forth, it is only neces Cl sary to rotate the turntable through the desired angle to position the diamond point‘ in a ,plane wherein it will dress the other, straight line by ‘movement of the arm 5| in the opposite direction. 3 table in a' plane "perpendicular to the turntable axis, an arm pivoted to said slideable member on an axis in a plane perpendicular to said turntable axis,'a cutting element carried by said arm eccen trically of said arm pivot, and means for estab lishing a ?xed plane of reference for said cutting element‘ with'respect to said work support, said While certain of the outstanding capabilities a means including an arm pivotally mounted on an of the unit are described above, it is believed 10 clear that the device is adapted for use in: other ways than those outlined. Moreover, in any case it is possible, by means of the plane of reference established by surface 56 on arm 54, and suitable trigonometric or other mathematical calculations, 15 to determine the settings and amount of adjust ment required on the turntable, the micrometer screw 3! or the swinging arm 5| for any given’ axis ?xed with respect to said work support and swingable in a plane parallel to the axes of said 10 wheel and said turntable. ‘ 3. In combination, a grinding wheel having a bed, a grinding wheel rotatably supported on said bed; a work support carried by said bed,'said grinding wheel and work support being relatively 15 movable in lines parallel and perpendicular to the plane of the wheel axis, a cutting element, means for connecting the cutting element to the bed including a pair of trunnions positioned at right angles with respect to each other, said cut 20 grinding pro?le. The extent of these adjust ments is indicated by suitable micrometer scales. The dressing unit is of particular value in 20 dressing a very narrowface grinding wheel hav » ting element being mounted on one of said trun ‘ing a complicated grinding contour such as would nions and the other of said trunnions being be used for grinding small complicated elements, mounted on said bed, independent means for ad but it is obvious that it may be applied} to larger justably' ?xing said trunnions against rotation respectively, means for adjusting one of said 25 25 grinding surfaces with advantage. trunnions axially thereof with respect to the _ I claim: _ 1. In combination, a grinding machine having other, and means for establishinga ?xed plane a bed,_a grinding wheel rotatably supported on of reference for, said cutting element withre said bed,- a work support carried by said bed,\spect to saidvwork support. 30 means for adjusting said grinding wheel and. work support relatively'in lines parallel and per 4. In a grinding wheel dressing unit, a bed, a trunnion rotatably carried by said bed, .an arm " pendicular to‘ a vertical plane through the axis pivotally connected to said trunnion onvan axis linear movement perpendicular to theaxis of the of said trunnion axis. of the wheel, a wheel dressing unit mounted on perpendicular to the trunnion axis, a cutting ele ment carried by said arm 'eccentrically of said said work support, said unit comprising a turn ‘pivot, and_ means for adjusting said -arm with. 35 tablerotatably carried on an axis ?xed with 35 respect to the work support and located in a plane ' respect tcysaid trunnion rectilinearly in a direc- , perpendicular to the wheel axis, a slide member tion parallel to said pivotal axis to selectively, position said cutting element. on opposite sides \ adiustably carried by said turntable’for'recti _ v 5. In a grinding wheel dressing unit, a-bed, a 40 an arm pivoted to said slide member , 40 turntable, on an axis perpendicular to and intersecting the trunnion rotatably carried by said bed, an arm axis of said turntable, and a cutting element car- - pivotally connected to said trunnion on an axis ried by said arm eccentrically ‘of said am pivot. 2. In combination, a grinding machine having a bed, a grinding wheel rotatably supported on 45 said bed, a work support carried by said bed, said grinding wheel and work support being relatively movable in lines parallel and perpendicular to the plane of the wheel axis, a turntable pivotally mounted on said work support, a slideable member movable rectilinearly with respect to_ said tum- perpendicular to the trunnion axis, a cutting- ele ment' carried by said arm eccentrically of said pivot, independent means for adjustably ?xing 45 said arm and trunnion against rotation respec tively and means for adjusting said arm with respect to said trunnion rectilinearly in adirec tionparallel to said pivot axis. \ JOHIl w. PARKER.